Avi Ga Ugoite Oniisan Ga Ichau Monogatari

The main character lives a college life in a certain rural town.
The witch Avi invites a guy who came to ask the way on a snowy mountain to a horny ceremony.
The ceremony was that she wanted him to fuck with her until she gathers enough magical powers.
Will it be possible for him and Avi to succeed in a horny ritual?
Try to mix with fapping for a more complete experience.